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CVE-2019-12290

Description

GNU libidn2 before 2.2.0 fails to perform the roundtrip checks specified in RFC3490 Section 4.2 when converting A-labels to U-labels. This makes it possible in some circumstances for one domain to impersonate another. By creating a malicious domain that matches a target domain except for the inclusion of certain punycoded Unicode characters (that would be discarded when converted first to a Unicode label and then back to an ASCII label), arbitrary domains can be impersonated.


Affected Package


OS OS Version Package Name Package Version
Debian 12 libidn2 2.3.3-1
Debian 11 libidn2 2.3.0-5
Debian 10 libidn2 2.0.5-1+deb10u1
Debian 999 libidn2 2.3.3-1

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